If you search "Mystery Coolant Leak" there'll be a discussion on my experience.

I was originally told by Blue Devil the sealant was a "permanent" fix and that I could either leave it in or take it out. I chose to take it out so did a coolant flush. It held for about a month then started to leak at the same location.

Under warranty I got a new bottle and it sealed again - I have since left it in and no further leaking.

It's against my nature to "fix" something this way, but I had spent a ton of time already with the truck in the garage and needed to move on with other stuff. I will attempt a proper fix in the spring as I suspect an aftermarket gasket failed. I already have a new OEM to replace.

The Blue Devil seeks out air, so when a leak goes outside the engine to air, it forms a seal. It will not clog anything in the engine and does not contain copper particles like other sealants. It only seals leaks less then 1/32".

I'm not sure how their head gasket sealant works. You should do some tracing to determine what type of leak it is. I used a dye to help me trace the source as the leak was way up behind the PS pump.